KR20090048047A - Composites for phosphor and plasma display panel - Google Patents

Abstract

The present invention relates to a phosphor composition and a plasma display panel.

Phosphor composition according to an embodiment of the present invention comprises a phosphor powder (Powder), a binder (Binder), a solvent (Solvent) and a pigment (Pigment), the binder content is at least 3% of the content of the phosphor powder 20 Can be less than or equal to

In addition, the plasma display panel according to another embodiment of the present invention includes a front substrate, a rear substrate disposed to face the front substrate, a phosphor layer disposed between the front substrate and the rear substrate, and the phosphor layer is red (Red). ) A first phosphor layer that emits light, a second phosphor layer that emits blue light, and a third phosphor layer that emits green light, wherein the first phosphor layer comprises a red pigment. And a carbon content of at least one of the first phosphor layer, the second phosphor layer, or the third phosphor layer may be 500 parts per million (ppm) or less.

Description

Phosphor Composition and Plasma Display Panel

The present invention relates to a phosphor composition and a plasma display panel.

In the plasma display panel, a phosphor layer is formed in a discharge cell divided by a partition, and a plurality of electrodes are formed.

When the drive signal is supplied to the electrode of the plasma display panel, the discharge is generated by the drive signal supplied in the discharge cell. Here, when discharged by a drive signal in the discharge cell, the discharge gas filled in the discharge cell generates vacuum ultraviolet rays, and the vacuum ultraviolet light emits the phosphor formed in the discharge cell to emit visible light. Generate. The visible light displays an image on the screen of the plasma display panel.

One aspect of the present invention is to provide a phosphor composition capable of reducing the content of carbon contained in the phosphor layer and reducing the reflectance of the phosphor layer.

Another object of the present invention is to provide a plasma display panel capable of reducing the carbon content and the reflectance included in the phosphor layer.

Phosphor composition according to an embodiment of the present invention comprises a phosphor powder (Powder), a binder (Binder), a solvent (Solvent) and a pigment (Pigment), the binder content is at least 3% of the content of the phosphor powder 20 Can be less than or equal to

In addition, the content of the binder may be 5% or more and 17% or less of the content of the phosphor powder.

In addition, the content of the phosphor powder may be 25 parts by weight or more and 50 parts by weight or less, the content of the binder may be 2 parts by weight or more and 9 parts by weight or less, and the content of the solvent may be 45 parts by weight or more and 75 parts by weight or less.

In addition, the pigment is a red pigment, the content of the red pigment may be 0.002 parts by weight or more and 3 parts by weight or less.

In addition, the red pigment may include an iron (Fe) material.

In addition, the pigment is a blue pigment, the content of the blue pigment may be 0.002 parts by weight or more and 3 parts by weight or less.

In addition, the blue pigment may include at least one of cobalt (Co) material, copper (Cu) material, chromium (Cr) material or nickel (Ni) material, aluminum (Al) material, titanium (Ti) material, or neodymium (Nd) material. It may include.

In addition, the plasma display panel according to another embodiment of the present invention includes a front substrate, a rear substrate disposed to face the front substrate, a phosphor layer disposed between the front substrate and the rear substrate, and the phosphor layer is red (Red). ) A first phosphor layer that emits light, a second phosphor layer that emits blue light, and a third phosphor layer that emits green light, wherein the first phosphor layer comprises a red pigment. And a carbon content of at least one of the first phosphor layer, the second phosphor layer, or the third phosphor layer may be 500 parts per million (ppm) or less.

In addition, the content of the red pigment may be 0.01 parts by weight or more and 5 parts by weight or less.

In addition, the red pigment may include an iron (Fe) material.

In addition, the second phosphor layer may comprise a blue pigment.

In addition, content of a blue pigment may be 0.01 weight part or more and 5 weight part or less.

In addition, the blue pigment may include at least one of cobalt (Co) material, copper (Cu) material, chromium (Cr) material or nickel (Ni) material, aluminum (Al) material, titanium (Ti) material, or neodymium (Nd) material. It may include.

In addition, the third phosphor layer may comprise a green pigment.

In addition, the content of the green pigment may be 0.01 parts by weight or more and 3 parts by weight or less.

In addition, the green pigment may include a zinc (Zn) material.

The present invention has the effect of lowering the reflectance to improve the contrast characteristic and lowering the carbon content of the phosphor layer to improve the luminance characteristic.

Hereinafter, the phosphor composition and the plasma display panel according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining the structure of a plasma display panel according to an embodiment of the present invention.

Referring to FIG. 1, the plasma display panel 100 according to an embodiment of the present invention includes a front substrate 101 on which scan electrodes 102 and Y and sustain electrodes 103 and Z which are parallel to each other are disposed, and a front substrate ( It may include a rear substrate 111 disposed opposite to 101 and having an address electrode 113 intersecting with the scan electrode 102 and the sustain electrode 103.

An upper dielectric layer 104 may be disposed on the scan electrode 102 and the sustain electrode 103 to insulate the scan electrode 102 and the sustain electrode 103.

A protective layer 105 may be disposed over the upper dielectric layer 104 to facilitate discharge conditions. The protective layer 105 may include a material having a high secondary electron emission coefficient, such as magnesium oxide (MgO).

In addition, an address electrode 113 may be disposed on the rear substrate 111, and a lower dielectric layer 115 may be disposed on the address electrode 113 to insulate the address electrode 113.

On top of the lower dielectric layer 115, a discharge space, that is, a partition wall 112 such as a stripe type, a well type, a delta type, a honeycomb type, etc., which partitions a discharge cell, may be disposed. Can be. The barrier rib 112 may be provided with a red (R), green (G), and blue (B) discharge cell between the front substrate 101 and the rear substrate 111. In addition, in addition to the red (R), green (G), and blue (B) discharge cells, white (W) or yellow (Yellow: Y) discharge cells may be further provided.

In the discharge cell partitioned by the partition wall 112, a discharge gas such as xenon (Xe), neon (Ne), or the like may be filled.

In addition, a phosphor layer 114 that emits visible light for image display may be disposed in the discharge cell partitioned by the partition wall 112. For example, a first phosphor layer emitting red (R) light, a second phosphor layer emitting blue (B) light, and a third phosphor layer emitting green (G) light are disposed. Can be. In addition to the red (R), green (G), and blue (B) light, it is also possible to further arrange other phosphor layers emitting white (W) light or yellow (Yellow: Y) light.

In addition, the thickness of the phosphor layer 114 in at least one of the red (R), green (G), and blue (B) discharge cells may be different from other discharge cells. For example, a phosphor layer of a green (G) discharge cell, that is, a phosphor layer in a third phosphor layer or a blue (B) discharge cell, that is, a thickness of a second phosphor layer in a red (R) discharge cell, That is, it may be thicker than the thickness of the first type of phosphor layer. Here, the thickness of the third phosphor layer may be substantially the same or different from the thickness of the second phosphor layer.

In addition, the widths of the red (R), green (G), and blue (B) discharge cells may be substantially the same, but at least one of the red (R), green (G), and blue (B) discharge cells may have a width. It is also possible to differ from the width of other discharge cells. For example, the width of the red (R) discharge cell is the smallest, and the width of the green (G) and blue (B) discharge cells can be made larger than the width of the red (R) discharge cell. Here, the width of the green (G) discharge cell may be substantially the same as or different from the width of the blue (B) discharge cell. Then, color temperature characteristics of the image to be implemented may be improved.

In addition, not only the structure of the partition wall 112 shown in FIG. 1, but also the structure of the partition wall having various shapes is possible. For example, the partition wall 112 includes a first partition wall 112b and a second partition wall 112a, where the height of the first partition wall 112b and the height of the second partition wall 112a are different from each other. Etc. are possible. In the case of the differential partition wall structure, the height of the first partition wall 112b among the first partition wall 112b or the second partition wall 112a may be lower than the height of the second partition wall 112a.

In addition, although the red (R), green (G), and blue (B) discharge cells are each shown and described as being arranged on the same line in FIG. 1, they may be arranged in other shapes. For example, a delta type arrangement in which red (R), green (G) and blue (B) discharge cells are arranged in a triangular shape is also possible. In addition, the shape of the discharge cell is not only rectangular but also various polygonal shapes such as pentagon and hexagon.

In addition, in FIG. 1, only the case where the partition wall 112 is formed on the rear substrate 111 is illustrated, but the partition wall 112 may be disposed on at least one of the front substrate 101 and the rear substrate 111.

In addition, the above description shows only the case where the lower dielectric layer 115 and the upper dielectric layer 104 is one layer, but at least one of the lower dielectric layer 115 or the upper dielectric layer 104 is a plurality of layers. It is also possible to form a layer of.

In addition, although the width and thickness of the address electrode 113 disposed on the rear substrate 111 may be substantially constant, the width or thickness inside the discharge cell may be different from the width or thickness outside the discharge cell. For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

2 is a view for explaining an example of the structure of the scan electrode and the sustain electrode.

Referring to FIG. 2, the scan electrode 102 and the sustain electrode 103 may each have a multi-layer structure. For example, the scan electrode 102 and the sustain electrode 103 may include the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b.

Here, the bus electrodes 102b and 103b include at least one of a substantially opaque material such as silver (Ag), gold (Au), and aluminum (Al), and the transparent electrodes 102a and 103a are substantially transparent. The material may include, for example, indium tin oxide (ITO) material.

In addition, when the scan electrode 102 and the sustain electrode 103 include the bus electrodes 102b and 103b and the transparent electrodes 102a and 103a, the reflection of external light by the bus electrodes 102b and 103b is prevented. The black layers 120 and 130 may be further included between the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b.

On the other hand, the transparent electrodes 102a and 103a may be omitted from the scan electrode 102 and the sustain electrode 103. That is, the scan electrode 102 and the sustain electrode 103 can also be ITO-Less electrodes in which the transparent electrodes 102a and 103a are omitted.

3 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention. 3 illustrates an example of a method of operating a plasma display panel according to an embodiment of the present invention, and the present invention is not limited to FIG. 3.

Referring to FIG. 3, a reset signal may be supplied to a scan electrode in a reset period for initialization. The reset signal may include a ramp-up signal and a ramp-down signal.

For example, in the set-up period, a rising ramp signal may be supplied to the scan electrode to gradually increase the voltage. Then, in the setup period, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

In the set-down period after the setup period, the rising ramp signal may be supplied to the scan electrode after the rising ramp signal in the opposite polarity direction. Then, a weak erase discharge, that is, a set down discharge, occurs in the discharge cell. By this set-down discharge, wall charges such that address discharge can be stably generated in the discharge cells remain uniformly.

In the address period after the reset period, a scan bias signal that substantially maintains a voltage higher than the lowest voltage of the falling ramp signal, for example, the sixth voltage V6, is supplied to the scan electrode.

In addition, a scan signal falling from the scan bias signal may be supplied to the scan electrode.

Meanwhile, the pulse width of the scan signal Scan supplied to the scan electrode in the address period of at least one subfield may be different from the pulse width of the scan signal of another subfield. For example, the width of the scan signal in the subfield located later in time may be smaller than the width of the scan signal in the preceding subfield. In addition, the reduction of the scan signal width according to the arrangement order of the subfields may be made gradually, such as 2.6 Hz, 2.3 Hz, 2.1 Hz, 1.9 Hz, or 2.6 Hz, 2.3 Hz, 2.3 Hz, 2.1 Hz ... 1.9 GHz, 1.9 GHz, or the like.

As such, when the scan signal is supplied to the scan electrode, the data signal may be supplied to the address electrode corresponding to the scan signal.

When the scan signal and the data signal are supplied, an address discharge may be generated in the discharge cell to which the data signal is supplied while the voltage difference between the scan signal and the data signal and the wall voltage generated by the wall charges generated in the reset period are added. .

Here, the sustain bias signal may be supplied to the sustain electrode in order to prevent the address discharge from becoming unstable due to the interference of the sustain electrode in the address period.

The sustain bias signal can keep the sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and larger than the voltage of the ground level GND.

Subsequently, in the sustain period for displaying an image, a sustain signal may be supplied to at least one of the scan electrode and the sustain electrode. For example, a sustain signal may be alternately supplied to the scan electrode and the sustain electrode.

When such a sustain signal is supplied, the discharge cell selected by the address discharge is added with the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal, and a sustain discharge, i.e., display between the scan electrode and the sustain electrode when the sustain signal is supplied. Discharge may occur.

Meanwhile, in the at least one subfield, a plurality of sustain signals are supplied in the sustain period, and the pulse width of at least one sustain signal of the plurality of sustain signals may be different from the pulse widths of other sustain signals. For example, the pulse width of the sustain signal that is supplied first of the plurality of sustain signals may be larger than the pulse width of other sustain signals. Then, the sustain discharge can be more stabilized.

4 is a view for explaining the phosphor layer in more detail.

Referring to FIG. 4, the phosphor layer includes a first phosphor layer 114R that emits red light, a second phosphor layer 114B that emits blue light, and a third that emits green light. Phosphor layer 114G.

In addition, the first phosphor layer 114R may include a red pigment 420 as shown in (a), and may also include a white phosphor-based first phosphor material 400.

The red pigment 420 may have a reddish color and may be mixed with the first phosphor material 400 so that the first phosphor layer 114R has a reddish color. Accordingly, the reflectance of the first phosphor layer 114R may be reduced, thereby improving contrast characteristics.

The red pigment 420 is not particularly limited except that the color is red-based, but it may be preferable to include an iron (Fe) material in consideration of ease of powder manufacturing, color, and manufacturing cost.

The iron (Fe) material may be in an iron oxide state in the first phosphor layer 114R. For example, the iron (Fe) material may be present in the αFe ₂ O ₃ state in the first phosphor layer 114R.

In addition, the second phosphor layer 114B may include a white phosphor-based second phosphor material 410 as shown in (b) but may not include a pigment.

On the other hand, it is also possible for the second phosphor layer 114B to contain a blue pigment in order to further improve the contrast characteristics. This will be described with reference to FIG. 5.

5 is a diagram for explaining the second phosphor layer.

Referring to FIG. 5, the second phosphor layer 114B may include a blue pigment 430 and may include a second phosphor material 410 having a white-based color.

The blue pigment 430 may have a blue color, and may be mixed with the second phosphor material 410 such that the second phosphor layer 114B has a blue color. As a result, the reflectance of the second phosphor layer 114B may be reduced, so that contrast characteristics may be improved.

The blue pigment 430 is not particularly limited except that the color is blue, but considering the ease of powder manufacture, color, and production cost, a cobalt (Co) material, a copper (Cu) material, and chromium (Cr) ) Material or nickel (Ni), aluminum (Al), titanium (Ti) or neodymium (Nd) may include at least one of the material, more preferably may be cobalt material.

The blue pigment may be in the metal oxide state in the second phosphor layer 114B. For example, the cobalt (Co) material may be present in the CoAl ₂ O ₄ state in the second phosphor layer 114B.

6 is a view for explaining the relationship between the red pigment and the reflectance in more detail.

In FIG. 6, a 7-inch test model in which a first phosphor layer emitting red light is disposed in all discharge cells is fabricated, and light is directly irradiated on the partition walls and the first phosphor layer in a state where the front substrate is removed. The measured data is shown.

Here, the first phosphor layer includes a first phosphor material and a red pigment material, the first phosphor material is (Y, Gd) BO: Eu, and the red pigment is iron (Fe) material.

① is the case where the first phosphor layer does not contain a red pigment, ② is the case where the first phosphor layer contains 0.1 parts by weight of red pigment, and ③ is the case where the first phosphor layer contains 0.5 parts by weight of the red pigment. to be.

Referring to FIG. 6, when the red pigment is not mixed in the first phosphor layer as in ①, the reflectance is 75% or more in all wavelength bands from 400 nm to 750 nm. As such, the reason why the reflectance is high when the red pigment is omitted is that most of the first phosphor material having a white-based color reflects incident light.

As shown in (2), when 0.1 parts by weight of red pigment is mixed in the first phosphor layer, the reflectance is about 60% or less in the wavelength range of 400 nm to 550 nm, and the reflectance is about 60% or more and 75% or less in the wavelength range of 550 nm or more. to be.

As shown in Fig. 3, when 0.5 parts by weight of red pigment is mixed in the first phosphor layer, the reflectance is about 50% or less in the wavelength range of 400 nm to 550 nm, and the reflectance is about 50% or more and 70% or less in the band where the wavelength is 550 nm or more. to be.

As described above, the reason why the reflectance decreases when the red pigment is mixed with the first phosphor layer is because the red pigment having the red-based color absorbs the incident light.

7 is a view for explaining the relationship between the content of the red pigment and the brightness.

In FIG. 7, a first phosphor layer is disposed in a red (R) discharge cell, a second phosphor layer is disposed in a blue (B) discharge cell, a third phosphor layer is disposed in a green (G) discharge cell, and a second Shown are data obtained by measuring the luminance while varying the content of the red pigment mixed in the first phosphor layer while 1.0 part by weight of the blue pigment is mixed in the phosphor layer. Here, the luminance according to the image of the 75% window pattern was measured in the panel state where the front substrate and the rear substrate were bonded.

The first phosphor material is (Y, Gd) BO: Eu, the red pigment is iron (Fe) material, and the iron (Fe) material is mixed with the first phosphor material in the state of αFe ₂ O ₃ .

In addition, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , the blue pigment is a cobalt (Co) material, such a cobalt (Co) material is mixed with the second phosphor material in a CoAl ₂ O ₄ state have.

Referring to FIG. 7, the luminance of the image implemented when the red phosphor is not included in the first phosphor layer is about 176 [cd / m ² ].

When the content of the red pigment included in the first phosphor layer is 0.01 part by weight, the luminance of the image to be implemented is approximately 175 [cd / m ² ]. As such, the reason why the brightness of the image decreases when the red pigment is mixed is that the particles of the red pigment cover a part of the surface of the particles of the first phosphor material, whereby the particles of the red pigment are discharged in the discharge cell. This is because the generated ultraviolet rays prevent the irradiation of the particles of the first phosphor material.

When the content of the red pigment is between 0.1 parts by weight and 3 parts by weight, the luminance of the image to be realized has a stable value between approximately 168 [cd / m ² ] and 174 [cd / m ² ].

In addition, when the content of the red pigment is between 3 parts by weight and 5 parts by weight, the luminance of the implemented image has a value of approximately 160 [cd / m ² ] to 168 [cd / m ² ].

On the other hand, when the content of the red pigment is 6 parts by weight or more, the content of the red pigment included in the first phosphor layer may be excessive, and thus the area covered by the red pigment particles on the particle surface of the first phosphor material. By this excessive increase, the luminance of the image to be implemented is drastically reduced below approximately 149 [cd / m ² ].

As described above, when the content of the red pigment is increased, the reflectance may be reduced, but the brightness of the image may be decreased. Therefore, it may be desirable to control the content of the red pigment to prevent excessive degradation of brightness while reducing the reflectance. For example, the content of the red pigment in the first phosphor layer may be 0.01 parts by weight or more and 5 parts by weight or less, preferably 0.1 parts by weight or more and 3 parts by weight or less.

8 is a diagram for explaining the relationship between the blue pigment and the reflectance in more detail.

In FIG. 8, a 7-inch test model in which a second phosphor layer emitting blue light is disposed in all discharge cells is fabricated, and the reflectance is measured by directly irradiating light on the barrier rib and the second phosphor layer while the front substrate is removed. The data is shown.

Here, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , the blue pigment is a cobalt (Co) material, this cobalt (Co) material is mixed with the second phosphor material in the CoAl ₂ O ₄ state Was used.

① is the case where the second phosphor layer does not contain a blue pigment, ② is the case where the second phosphor layer contains 0.1 parts by weight of blue pigment, and ③ is the case where the second phosphor layer contains 1.0 parts by weight of the blue pigment. to be.

Referring to FIG. 8, when the blue pigment is not mixed in the second phosphor layer as in ①, the reflectance is about 72% or more in all wavelength bands from 400 nm to 750 nm. As such, the reason why the reflectance is high when the blue pigment is omitted is that the second phosphor material having a white-based color reflects most of the incident light.

As shown in (2), when 0.1 part by weight of blue pigment is mixed in the second phosphor layer, the reflectance is approximately 74% or more in the wavelength band from 400 nm to 510 nm, and the reflectance is approximately 60% in the band in the wavelength range from 510 nm to 650 nm. Decreases and rises to approximately 72%.

When 1.0 parts by weight of blue pigment is mixed in the second phosphor layer as in?, The reflectance is at least 50% or less in the wavelength range from 510 nm to 650 nm.

As described above, the reason why the reflectance decreases when the blue pigment is mixed with the second phosphor layer is because the blue pigment having the blue-based color absorbs the incident light. As such, when the reflectance is decreased, contrast characteristics of the image to be implemented may be improved, and thus image quality of the image may be improved.

9 is a diagram for explaining the relationship between the content of blue pigment and the luminance. Hereinafter, the description thereof will be omitted.

In FIG. 9, a first phosphor layer is disposed in a red (R) discharge cell, a second phosphor layer is disposed in a blue (B) discharge cell, a third phosphor layer is disposed in a green (G) discharge cell, and a first phosphor layer is disposed. Shown are data obtained by measuring reflectance and brightness while varying the content of the blue pigment mixed in the second phosphor layer in a state in which 0.2 parts by weight of red pigment is mixed in the phosphor layer. Here, the luminance according to the 75% window pattern was measured in the panel state where the front substrate and the rear substrate were bonded.

Referring to FIG. 9, the luminance of an image implemented when the blue phosphor is not included in the second phosphor layer has a luminance of about 176 [cd / m ² ].

When the content of the blue pigment included in the second phosphor layer is 0.01 parts by weight, the luminance of the image to be implemented is approximately 175 [cd / m ² ].

When the content of the blue pigment is 0.1 parts by weight, the luminance of the implemented image is approximately 172 [cd / m ² ].

When the content of the blue pigment is between 0.5 parts by weight and 4 parts by weight, the luminance of the implemented image has a stable value between approximately 164 [cd / m ² ] and 170 [cd / m ² ].

In addition, when the content of the blue pigment is between 4 parts by weight and 5 parts by weight, the luminance of the implemented image has a value of approximately 160 [cd / m ² ] to 164 [cd / m ² ].

On the other hand, when the content of the blue pigment exceeds 6 parts by weight, the content of the blue pigment included in the second phosphor layer may be excessive, and thus the area covered by the particles of the blue pigment on the particle surface of the second phosphor material may be By excessively increasing, the luminance of the image to be implemented is drastically reduced to about 148 [cd / m ² ] or less.

As described above, when the content of the blue pigment is increased, the reflectance may be reduced, but the brightness of the image may be decreased. Therefore, it may be desirable to control the content of the blue pigment to reduce excessive reflectance while reducing the reflectance. For example, the content of the blue pigment in the second phosphor layer may be 0.01 parts by weight or more and 5 parts by weight or less, preferably 0.5 parts by weight or more and 4 parts by weight or less.

10 is a diagram for explaining an example of still another structure of the phosphor layer.

Referring to FIG. 10, the third phosphor layer 114G may include a green pigment 450.

For example, the first phosphor layer 114R includes a red pigment 420 and a first phosphor material 400 as shown in (a), and the second phosphor layer 114B is formed as shown in (c). The second phosphor material 410 and the blue pigment 430 may be included, and the third phosphor layer 114G may include the third phosphor material 440 and the green pigment 450 as shown in (b).

The green pigment 450 may have a green color, and may be mixed with the third phosphor material 440 such that the third phosphor layer 114G may have a green color. Accordingly, the reflectance of the third phosphor layer 114G may be reduced, so that the contrast characteristic may be further improved.

The green pigment 450 is not particularly limited except that the color is green-based. However, the green pigment 450 may include a zinc (Zn) material in consideration of ease of powder manufacturing, color, and manufacturing cost.

The zinc (Zn) material may be in a zinc oxide state in the third phosphor layer 114G. For example, the zinc (Zn) material may be present in the ZnCO ₂ O ₄ state in the third phosphor layer 114G.

11 is a diagram for explaining the relationship between the green pigment and the reflectance in more detail.

In FIG. 11, similar to the case of FIGS. 6 and 8, a 7-inch test model including a third phosphor layer that emits green light is disposed in all discharge cells, and the barrier rib and the third phosphor are removed with the front substrate removed. Shown are data obtained by measuring reflectance by direct irradiation of light onto the layer.

Here, the third phosphor material includes Zn ₂ Si0 ₄ : Mn ⁺² and YBO ₃ : Tb ⁺³ in a ratio of 5: 5, the green pigment is zinc (Zn), and the zinc (Zn) is ZnCO _A mixture of a third phosphor material in the state of ₂ O ₄ was used.

① is the case where the third phosphor layer does not contain a green pigment, ② is the case where the third phosphor layer contains 0.1 parts by weight of green pigment, and ③ is the case where the third phosphor layer contains 0.5 parts by weight of the green pigment. (4) is the case where the third phosphor layer contains 1.0 part by weight of the green pigment.

When the green pigment is not mixed in the third phosphor layer as in?, The reflectance is 75% or more in all wavelength bands from 400 nm to 750 nm. In the band of 400 nm or more and 500 nm or less, the reflectance is approximately 80% or more.

As such, the reason why the reflectance is high when the green pigment is omitted is that the third phosphor material having a white-based color reflects most of the incident light.

As shown in (2), when 0.1 parts by weight of green pigment is mixed in the third phosphor layer, the reflectance is about 75% or less in the wavelength range of 400 nm to 550 nm, and the reflectance is about 66% or more in the wavelength range of 550 nm or more and 700 nm or less. Less than or equal to

In the case where 0.5 parts by weight of green pigment is mixed in the third phosphor layer as described above, the reflectance is about 73% or less in the wavelength range of 400 nm to 550 nm, and the reflectance is about 63% or more and 65% or less in the wavelength range of 550 nm or more. to be.

In the case where 1.0 parts by weight of green pigment is mixed in the third phosphor layer as in?, The reflectance is similar to the case of? In all bands from 400 nm to 750 nm in wavelength.

As described above, the reason why the reflectance decreases when the green pigment is mixed with the third phosphor layer is because the green pigment having the green color has absorbed the incident light.

In addition, the similarity of the reflectance in the case of ③ and ④ may mean that the effect of improving the reflectance is insignificant even if the content of the green pigment is increased.

It is a figure for demonstrating the relationship between content of a green pigment, and brightness | luminance.

12, a first phosphor layer is disposed in a red (R) discharge cell, a second phosphor layer is disposed in a blue (B) discharge cell, a third phosphor layer is disposed in a green (G) discharge cell, and a second While measuring 1.0 parts by weight of blue pigment in the phosphor layer and 0.2 parts by weight of red pigment in the first phosphor layer, the data of measuring reflectance and brightness while varying the content of the green pigment mixed in the third phosphor layer are shown. It is. Here, the luminance according to the 75% window pattern was measured in the panel state where the front substrate and the rear substrate were bonded.

Here, the first phosphor material is (Y, Gd) BO: Eu, the red pigment is iron (Fe) material, this iron (Fe) material is used mixed with the first phosphor material in the state of αFe ₂ O ₃ It was.

In addition, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , the blue pigment is a cobalt (Co) material, this cobalt (Co) material is mixed with the second phosphor material in a CoAl ₂ O ₄ state Was used.

In addition, the third phosphor material includes Zn ₂ Si0 ₄ : Mn ⁺² and YBO ₃ : Tb ⁺³ in a ratio of 5: 5, and the green pigment is zinc (Zn), and the zinc (Zn) is ZnCO _A mixture of a third phosphor material in the state of ₂ O ₄ was used.

Referring to FIG. 12, the luminance of an image implemented when the third phosphor layer does not include a green pigment has a luminance of about 175 [cd / m ² ].

In addition, when the content of the green pigment included in the third phosphor layer is 0.01 parts by weight, the luminance of the image to be implemented is approximately 174 [cd / m ² ]. As such, the reason why the brightness of the image decreases when the green pigment is mixed is that the particles of the green pigment cover a part of the particle surface of the third phosphor material, whereby the particles of the green pigment are discharged in the discharge cell. This is because the generated ultraviolet rays prevent the irradiation of the particles of the third phosphor material.

When the content of the green pigment is between 0.05 parts by weight and 2.5 parts by weight, the luminance of the image to be realized has a stable value between approximately 166 [cd / m ² ] and 172 [cd / m ² ].

In addition, when the content of the green pigment is 3 parts by weight, the luminance of the implemented image is approximately 164 [cd / m ² ].

On the other hand, when the content of the green pigment is 4 parts by weight or more, the content of the green pigment contained in the third phosphor layer may be excessive, and thus the area covered by the particles of the green pigment on the particle surface of the third phosphor material. By this excessive increase, the luminance of the image to be implemented is drastically reduced below approximately 149 [cd / m ² ].

As described above, when the content of the green pigment is increased, the reflectance may be reduced, but the brightness of the image may be decreased. Therefore, it may be desirable to control the content of the green pigment to prevent excessive degradation of brightness while reducing the reflectance. For example, the content of the green pigment in the third phosphor layer may be 0.01 parts by weight or more and 3 parts by weight or less, preferably 0.05 parts by weight or more and 2.5 parts by weight or less.

In addition, even if the content of the green pigment is increased, the effect of improving the panel reflectance is insignificant compared to the case of the red pigment and the blue pigment. Accordingly, it may be desirable for the content of green pigments to be less than that of red and blue pigments. It is also possible to omit the green pigment.

Meanwhile, a carbon component may remain in the phosphor layer, and the carbon component may be a factor of lowering luminance characteristics.

For example, the carbon remaining in the phosphor layer can be released into the panel in certain circumstances. Then, carbon may combine with oxygen to generate an impure gas such as carbon monoxide (CO) or carbon dioxide (CO ₂ ), and the impurity gas generated by carbon may prevent the discharge gas from emitting ultraviolet rays, Accordingly, the luminance of the image may be reduced by reducing the amount of ultraviolet rays irradiated onto the phosphor layer.

In addition, when the phosphor layer contains a pigment, the phosphor layer may be covered by the pigment particles, and thus the luminance may be further reduced by reducing the visible light divergence area of the phosphor layer. Therefore, when the phosphor layer contains a pigment, it may be desirable to reduce the carbon content of the phosphor layer to prevent excessive brightness degradation.

It is a figure for demonstrating the relationship between carbon content and brightness | luminance.

FIG. 13 illustrates data for observing luminance according to a full-white pattern when the carbon content of the phosphor layer is between 100 ppm (Parts Per Million) and 700 ppm. Here, the full-white pattern is an image pattern for turning on all discharge cells.

Referring to FIG. 13, when the carbon content of the phosphor layer is 100 ppm, the luminance of the full-white pattern image is about 150 [cd / m ² ].

Further, when the carbon content of the phosphor layer is 200 ppm, the luminance of the full-white pattern image is approximately 149 [cd / m ² ], 300 ppm is 147 [cd / m ² ], and 400 ppm is 145 [cd]. / m ² ], 500 ppm, 142 [cd / m ² ], 600 ppm, 134 [cd / m ² ], and 700 ppm, 132 [cd / m ² ].

In the above data, when the carbon content of the phosphor layer is 100ppm to 500ppm, the brightness of the image decreases slowly as the carbon content of the phosphor layer is increased, and when the carbon content of the phosphor layer is 500ppm to 700ppm, It can be seen that the sharp decrease.

Therefore, in order to prevent the luminance of the image from being excessively reduced, it may be preferable that the carbon content of the phosphor layer is 500 ppm or less. In such a case, it is possible to prevent the luminance of the image from being excessively reduced even when the phosphor layer contains a pigment.

14 is a view for explaining the configuration of the phosphor layer in consideration of the color temperature characteristics. Here, in the carbon content, a mark indicates that the carbon content is 500 ppm or less, and an X mark indicates that the carbon content is more than 500 ppm. In addition, the X mark in a pigment shows that it does not contain a pigment.

Referring to FIG. 14, the first phosphor layer may include a red pigment, the second phosphor layer may include a blue pigment, and the third phosphor layer may not include the pigment. The red pigment may be preferably an iron material, and the blue pigment may be a cobalt material.

As such, the reason why the third phosphor layer does not include a pigment is that when the third phosphor layer includes a green pigment, the amount of green light emitted by the third phosphor layer is reduced, thereby excessively lowering the overall luminance characteristic of the panel. Because it can be.

Further, the second phosphor layer and the third phosphor layer have a carbon content of 500 ppm or less, and the first phosphor layer has a carbon content of more than 500 ppm.

As such, when the carbon content of the first phosphor layer is more than 500 ppm and the carbon content of the second and third phosphor layers is 500 ppm or less, the amount of blue light and green light may be increased compared to the red light. Then, the color temperature characteristics may be improved by accentuating blue and green colors relative to red in the image to be implemented.

It is a figure for demonstrating an example of the manufacturing method of a phosphor layer.

As shown in FIG. 15, the phosphor powder, a binder, a solvent, and a pigment may be mixed to form a phosphor composition (S1500). The phosphor composition may be in a paste state or a slurry state.

In such a phosphor composition, a surfactant, silica, a dispersion stabilizer, etc. may be further added as an additive as necessary.

Here, the phosphor powder may be at least one of a YVPO ₄ : Eu material or a (Y, Gd) BO: Eu material as a red phosphor powder for generating red light, and as a blue phosphor powder for generating blue light (Ba, Sr, Eu) MgAl ₁₀ O _{17 It} may be a material, and green phosphor powder for generating green light may be at least one of Zn ₂ Si0 ₄ : Mn ⁺² material or YBO ₃ : Tb ⁺³ material.

In addition, the binder is not particularly limited and may be an ethyl cellulose or acrylic resin-based, or a polymer-based binder such as PMA or PVA.

In addition, the solvent used is not particularly limited, and α-terpineol, butylcarbitol, diethylene glycol, methyl ether and the like can be used.

In addition, the pigment may be a red pigment, blue pigment or green pigment as described in detail above.

Here, when the content of the phosphor powder is excessively high, the manufacturing cost may increase excessively with the increase of the amount of the phosphor powder. On the other hand, when the amount of the phosphor powder is excessively low, the visible light generated by excessively thin thickness of the phosphor layer formed therefrom The luminance can be reduced by reducing the amount of lines. In consideration of this, the content of the phosphor powder may be 25 parts by weight or more and 50 parts by weight or less.

In addition, when the content of the binder is excessively high, as will be described in detail later, the luminance may be excessively reduced by increasing the carbon content of the phosphor composition, whereas in the case where the content of the binder is excessively low, the molding of the phosphor layer may be difficult. In consideration of this, the content of the binder may be 2 parts by weight or more and 9 parts by weight or less.

In addition, when the content of the solvent is excessively high, the viscosity of the phosphor composition may be excessively low, so that a phenomenon in which the phosphor composition applied to the discharge cell overflows into adjacent adjacent discharge cells may frequently occur during the application process of the phosphor composition. In such a case, the viscosity of the phosphor composition may be excessively high, and thus it may be difficult to smoothly apply the phosphor composition to the discharge cells. In consideration of this, the content of the solvent may be 45 parts by weight or more and 75 parts by weight or less.

In addition, as described above in detail with reference to FIGS. 4 to 12, when the content of the pigment is excessively high, the reflectance may decrease, but the brightness may be excessively reduced, whereas when the content of the pigment is excessively low, the luminance may be reduced. The reduction can be prevented but the reflectance can be excessively high.

Therefore, in the case of a red pigment, for example, iron, the content may be 0.002 parts by weight or more and 3 parts by weight or less.

In addition, in the case of a blue pigment, for example, in the case of cobalt material, the content may be 0.002 parts by weight or more and 3 parts by weight or less.

In the case of a green pigment, for example, in the case of a zinc (Zn) material, the content may be 0.002 parts by weight or more and 2 parts by weight or less.

After the phosphor composition forming process, the phosphor composition may be applied to the discharge cells partitioned by the partition (S1510).

Thereafter, the phosphor composition applied to the discharge cell may be fired (S1520). Then, the phosphor layer may be formed by burning a binder, a solvent, or the like in the phosphor composition.

Meanwhile, in the S1500 process of mixing the phosphor powder, the binder, and the solvent, the carbon content of the phosphor composition may be changed according to the amount of the binder mixed in the phosphor composition.

As described in detail above, carbon contained in the phosphor composition may adversely affect the luminance characteristics of the plasma display panel including the phosphor layer formed therefrom.

16 to 17 are diagrams for explaining the carbon content and the resulting luminance characteristics of the phosphor composition.

FIG. 16 shows data on the carbon content according to the change of the binder content in the phosphor composition. The data shown in FIG. 17 measures carbon content by mixing phosphor powder, solvent, binder and pigment to form the phosphor composition, then burning the phosphor composition and analyzing the remaining material of the burned phosphor composition.

The phosphor powder used in A, B, C, and D types is YVPO ₄ : Eu material, and the phosphor powder used in E, F, G, and H types is (Y, Gd) BO: Eu material. Pigment in the A-H type is iron material, the content of which is the same 0.1 parts by weight.

Referring to FIG. 16, the type A phosphor composition is a mixture of 44.4 parts by weight of phosphor powder, 0.1 part by weight of iron, 35.5 parts by weight of solvent, and 20 parts by weight of a binder. The carbon content of this type A is approximately 1883 ppm (Parts Per Millon) to be.

The type B phosphor composition is a mixture of 44.4 parts by weight of phosphor powder, 41.5 parts by weight of solvent, 0.1 parts by weight of iron, and 14 parts by weight of a binder, and the carbon content of this type B is approximately 1080 ppm.

The C type phosphor composition is a mixture of 44.4 parts by weight of phosphor powder, 0.1 part by weight of iron material, 45.5 parts by weight of solvent, and 10 parts by weight of a binder. The carbon content of this B type is approximately 640 ppm.

The D-type phosphor composition is a mixture of 44.4 parts by weight of phosphor powder, 0.1 part by weight of iron material, 51.5 parts by weight of solvent, and 4 parts by weight of a binder. The carbon content of this D type is approximately 155 ppm.

The E type phosphor composition is a mixture of 31.4 parts by weight of phosphor powder, 0.1 part by weight of iron material, 49.5 parts by weight of solvent, and 19 parts by weight of a binder. The carbon content of this E type is approximately 2370 ppm.

The F type phosphor composition is a mixture of 31.4 parts by weight of phosphor powder, 0.1 part by weight of iron, 56.5 parts by weight of solvent, and 12 parts by weight of a binder. The carbon content of this F type is approximately 1825 ppm.

The G type phosphor composition is a mixture of 31.4 parts by weight of phosphor powder, 0.1 part by weight of iron material, 61.5 parts by weight of solvent, and 7 parts by weight of a binder. The carbon content of this G type is approximately 722 ppm.

The H type phosphor composition is a mixture of 31.4 parts by weight of phosphor powder, 0.1 part by weight of iron material, 63 parts by weight of solvent, and 5.5 parts by weight of a binder, and the carbon content of this H type is approximately 207 ppm.

In view of the above data of FIG. 16, it can be seen that the carbon content of the phosphor composition may be changed depending on the content of the binder.

FIG. 17 illustrates data about luminance of an image to be implemented according to a change in carbon content. The data shown in FIG. 17 is a plasma display panel of each type A to H using the phosphor composition of type A to H shown in FIG. 16, and luminance is measured while operating the manufactured plasma display panel.

When measuring the luminance, the luminance of the full-white (F / W) that turns all the discharge cells on, and the 25% window pattern image on the screen In each case, the luminance is measured. The unit of luminance is [cd / m ² ].

Referring to FIG. 17, when the driving voltage of 192 V is applied between the scan electrode and the sustain electrode in the case of A type, and the luminance of light generated in full-white is measured, the luminance is approximately 120 [cd / m ² ], 25 The luminance of light generated in the% window pattern is approximately 319 [cd / m ² ].

In the case of type B, the full-white luminance is approximately 126 [cd / m ² ], and the 25% window pattern luminance is approximately 327 [cd / m ² ].

In the case of type C, the full-white luminance is approximately 133 [cd / m ² ] and the 25% window pattern luminance is approximately 343 [cd / m ² ].

In the case of type D, the full-white luminance is approximately 149 [cd / m ² ] and the 25% window pattern luminance is approximately 377 [cd / m ² ].

In the case of type E, the full-white luminance is approximately 117 [cd / m ² ] and the 25% window pattern luminance is approximately 304 [cd / m ² ].

In the case of the F type, the full-white luminance is approximately 121 [cd / m ² ], and the 25% window pattern luminance is approximately 322 [cd / m ² ].

In the case of type G, the full-white luminance is approximately 132 [cd / m ² ] and the 25% window pattern luminance is approximately 338 [cd / m ² ].

In the case of type H, the full-white luminance is approximately 148 [cd / m ² ] and the 25% window pattern luminance is approximately 373 [cd / m ² ].

In consideration of the data of FIGS. 16 to 17, when the carbon content in the phosphor composition is relatively high, the luminance of an image implemented in the plasma display panel including the phosphor layer manufactured from the phosphor composition may be decreased. When the carbon content is relatively low, the luminance of the image to be implemented may be improved.

As described above, the reason why the luminance of the image is lowered as the carbon content is increased is as follows.

During the firing process of the phosphor composition, the binder contained in the phosphor composition is discharged to the carbon component included in the binder, so that carbon may be mixed in the discharge gas filled in the panel. Such carbon may combine with oxygen to generate an impure gas such as carbon monoxide (CO) or carbon dioxide (CO ₂ ). The impurity gas generated by carbon prevents the discharge gas from emitting ultraviolet rays, thereby reducing the amount of ultraviolet rays irradiated onto the phosphor layer, thereby reducing the luminance of the image.

In addition, the carbon component included in the binder may remain on the surface of the phosphor layer while the binder included in the phosphor composition is burned during the firing process of the phosphor composition. Then, a part of the surface of the phosphor layer may be covered by the carbon component, thereby reducing the luminance of the image to be realized.

18 is a view for explaining the ratio of the binder and the phosphor powder in the phosphor composition according to an embodiment of the present invention.

18, (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ material is used as the phosphor powder, an acrylic resin material is used as the binder, diethylene glycol is used as the solvent, and cobalt material DFM is used as the blue pigment. The data of measuring the carbon content of the phosphor composition is shown by forming the phosphor composition, and changing the ratio (B / P) of the binder and the phosphor powder from 1% to 25%.

Referring to FIG. 18, when the B / P is 1%, that is, when the content of the binder is 1% of the content of the phosphor powder, the carbon content of the phosphor composition is approximately 70 ppm.

When B / P is 3%, the carbon content of the phosphor composition is approximately 91 ppm.

When B / P is 5%, the carbon content of the phosphor composition is approximately 107 ppm.

When B / P is 10%, the carbon content of the phosphor composition is approximately 139 ppm.

Approximately 196 ppm for B / P 15%, approximately 282 ppm for B / P 17%, approximately 440 ppm for B / P 20%, approximately 895 ppm for B / P 25% to be.

Considering the data of FIG. 18, the carbon content of the phosphor layer is sufficiently low, in the range of B / P of 17% or less, and the carbon content of the phosphor layer in the range of B / P of 17% to 20%. Although increasing, it has a stable value between 300 ppm and approximately 450 ppm. In this case, as described in detail with reference to FIG. 13, the luminance of the image may have a sufficiently high value.

On the other hand, when the B / P is 25% or more it can be seen that the carbon content of the phosphor layer is rapidly increased to 800ppm or more. In this case, the brightness of the image may decrease rapidly.

On the other hand, when the content of the binder in the phosphor composition is excessively low, the viscosity of the phosphor composition may be excessively low, which may be disadvantageous for the phosphor layer forming process.

Therefore, in order to lower the carbon content and improve the luminance of the plasma display panel manufactured therefrom, and to sufficiently maintain the viscosity of the phosphor composition, the binder content in the phosphor composition is preferably 3% or more and 20% or less of the phosphor powder. More preferably, it may be 5% or more and 17% or less.

Here, the content of the binder 3% or more and 20% or less of the content of the phosphor powder may mean that the weight of the binder is 3% or more and 20% or less of the weight of the phosphor powder, or the volume of the binder It is also possible to mean 3% or more and 20% or less.

It is a figure for demonstrating the viscosity of a fluorescent substance composition.

19 shows data on the viscosity of the phosphor composition according to the ratio [B / P] of the binder content and the phosphor powder content.

Here, the phosphor powder is a mixture of Zn ₂ SiO ₄ : Mn ^{+ 2} material and YBO ₃ : Tb ^{+ 3} material 5: 5, the binder is an acrylic resin material, the solvent is diethylene glycol. In addition, no pigment was used.

Referring to FIG. 19, when the phosphor powder is 31.5 parts by weight, the solvent is 64 parts by weight, and the binder is 4.5 parts by weight, the B / P is 14.3, and the viscosity of the phosphor composition in this case is 20 Pa · s.

As Comparative Example 1, when the phosphor powder was 35 parts by weight, the solvent was 55.2 parts by weight, and the binder was 9.8 parts by weight, the B / P was 28, and the viscosity of the phosphor composition in this case was 45 Pa · s.

As Comparative Example 2, when the phosphor powder was 33 parts by weight, the solvent was 56.7 parts by weight, and the binder was 10.3 parts by weight, the B / P was 31.2, and the viscosity of the phosphor composition in this case was 53 Pa · s.

Comparing the Examples with Comparative Examples 1 and 2, the Examples had a B / P of approximately 14.3, a low binder content, and thus a relatively low carbon content, so that the luminance characteristics of the image were excellent, and the viscosity was 20 Pa.s. In Comparative Examples 1 and 2, the B / P is 28 and 31.2, and the luminance of the image obtained by the excessive carbon content in the phosphor composition is relatively low, and the viscosity is 45 Pa.s and 53 Pa.s, which is higher than that of the examples.

As such, when the B / P is 3% or more and 20% or less and preferably 5% or more and 17% or less, the viscosity of the phosphor composition may be relatively low by decreasing the binder content. Thus, the phosphor layer may be formed using the phosphor composition. In forming, it may be desirable to use a dispensing method. This will be described with reference to FIGS. 20 through 21.

20 to 21 are views for explaining a method for applying a phosphor composition.

An example of the dispensing method is shown in FIG. 20, and an example of the screen printing method is shown in FIG.

In the dispensing method, as shown in FIG. 20, the dispensing apparatus 600 dispenses the phosphor composition 610 in a paste or slurry state into a discharge cell partitioned by a partition wall from a substrate through a nozzle. Fencing, followed by a drying or firing process to form a phosphor layer.

In the screen printing method, as illustrated in FIG. 21, a screen mask 630 having a plurality of holes 631 is disposed, and after the phosphor composition 640 is disposed on the screen mask 630, a presser ( The phosphor composition 640 is applied to the substrate through a hole 631 formed in the screen mask 630 using a squeezer.

Comparing the screen printing method and the dispensing method, the dispensing method is to flow the phosphor composition to the discharge cell through the nozzle, and the screen printing method is a method of forcibly pushing the phosphor composition into the discharge cell by applying pressure using a press. can do.

Therefore, it may be desirable that the viscosity of the phosphor composition used in the dispensing method is lower than the viscosity of the phosphor composition used in the screen printing method. That is, the phosphor composition used for the dispensing method is thinner than the phosphor composition used for the screen printing method.

Considering the contents of FIGS. 20 to 21 and the data of FIG. 19 described above, the phosphor composition of the embodiment of FIG. 19 is used for the dispensing method, and the phosphor compositions of Comparative Examples 1 and 2 are preferably used for the screen printing method. can do. That is, as described in detail above, when the B / P is 3% or more and 20% or less, preferably 5% or more and 17% or less, the viscosity of the phosphor composition may be relatively low due to the decrease in the binder content, and thus the phosphor composition. It may be desirable to be used for the silver dispensing method.

On the other hand, when the viscosity of the phosphor composition according to an embodiment of the present invention is excessively low, a phenomenon in which the phosphor composition applied to the discharge cells overflows into adjacent adjacent discharge cells may frequently occur during the coating process of the phosphor composition. If the viscosity is excessively high, it is difficult for the phosphor composition to flow into the discharge cell through the nozzle.

Therefore, the viscosity of the phosphor composition according to an embodiment of the present invention may be preferably 15 Pa.s or more and 25 Pa.s or less.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

1 is a view for explaining the structure of a plasma display panel according to an embodiment of the present invention.

2 is a diagram for explaining an example of the structure of a scan electrode and a sustain electrode.

3 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention;

4 is a diagram for explaining the phosphor layer in more detail.

5 is a diagram for explaining a second phosphor layer.

FIG. 6 is a diagram for explaining the relation between red pigment and reflectance in more detail. FIG.

7 is a diagram for explaining the relationship between the content of red pigment and the luminance;

8 is a diagram for explaining the relationship between the blue pigment and the reflectance in more detail.

9 is a diagram for explaining the relationship between the content of blue pigment and the luminance;

10 is a diagram for explaining an example of still another structure of the phosphor layer.

11 is a diagram for explaining in detail the relationship between the green pigment and the reflectance.

12 is a diagram for explaining the relationship between the content and luminance of green pigments.

13 is a diagram for explaining the relationship between carbon content and luminance.

14 is a view for explaining the configuration of a phosphor layer in consideration of color temperature characteristics.

15 is a diagram for explaining an example of a method for producing a phosphor layer.

16 to 17 are diagrams for explaining the carbon content and the resulting luminance characteristics of the phosphor composition.

18 is a view for explaining the ratio of the binder and the phosphor powder in the phosphor composition according to an embodiment of the present invention.

19 is a diagram for explaining the viscosity of a phosphor composition.

20 to 21 are views for explaining a method for applying the phosphor composition.

Claims (16)

Phosphor powder; Binder; Solvent; And Pigments; Including, The content of the binder is less than 3% to 20% of the content of the phosphor powder phosphor composition. The method of claim 1, The binder content is a phosphor composition of 5% or more and 17% or less of the content of the phosphor powder. The method of claim 1, The content of the phosphor powder is 25 parts by weight or more and 50 parts by weight or less, The binder content is 2 parts by weight or more and 9 parts by weight or less, The content of the solvent is 45 parts by weight or more and 75 parts by weight or less. The method of claim 1, The pigment is a red pigment, The content of the red pigment is 0.002 parts by weight or more and 3 parts by weight or less. The method of claim 4, wherein The red pigment is a phosphor composition comprising an iron (Fe) material. The method of claim 1, The pigment is a blue pigment, The content of the blue pigment is a phosphor composition is 0.002 parts by weight or more and 3 parts by weight or less. The method of claim 6, The blue pigment includes at least one of cobalt (Co) material, copper (Cu) material, chromium (Cr) material or nickel (Ni) material, aluminum (Al) material, titanium (Ti) material or neodymium (Nd) material. Phosphor composition. Front substrate; A rear substrate disposed opposite the front substrate; A phosphor layer disposed between the front substrate and the rear substrate; Including, The phosphor layer includes a first phosphor layer that emits red light, a second phosphor layer that emits blue light, and a third phosphor layer that emits green light, The first phosphor layer comprises a red pigment, At least one carbon content of the first phosphor layer, the second phosphor layer, or the third phosphor layer is 500 ppm (Parts Per Million) or less. The method of claim 8, The content of the said red pigment is a plasma display panel whose 0.01 weight part or more and 5 weight parts or less. The method of claim 8, The red pigment includes a plasma (Fe) material. The method of claim 8, And the second phosphor layer comprises a blue pigment. The method of claim 11, Content of the said blue pigment is a plasma display panel whose 0.01 weight part or more and 5 weight parts or less. The method of claim 11, The blue pigment includes at least one of cobalt (Co) material, copper (Cu) material, chromium (Cr) material or nickel (Ni) material, aluminum (Al) material, titanium (Ti) material or neodymium (Nd) material. Plasma display panel. The method of claim 8, And the third phosphor layer comprises a green pigment. The method of claim 14, Content of the said green pigment is a plasma display panel of 0.01 weight part or more and 3 weight part or less. The method of claim 14, The green pigment is a plasma display panel comprising a zinc (Zn) material.

Images